Burglar alarm



F. E. SPARKS.

BURGLAR ALARM. APPLICATION FILED FEB. is. 1922.

1 85,882, Patented Nov. M, 192% INVENTOR ATTORN EY Patented Nov. 114 i922.

FRED E. SPARKS, 0F AKRON, OHIO.

BURGLAR ALARM.

Application filed February 18, 1922. Serial No. 537,533.

To all whom it may concern Be it known that l, FRED E. gPARKS, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented new and useful Improvements in Burglar Alarms, of which the following is a specification.

This invention relates to alarm devices, and more particularly to a burglar alarm specially adapted for use on doors and similar swinging structures.

One of the main objects of the invention is to provide a burglar alarm of simple construction and operation which may be readily applied to a door or other hinged structure of standard construction. Another object is to provide a device of the character stated which may be quickly and easily rendered operative or inoperative, as desired. Further objects will appear from the detailed description. I

In the drawings Figure 1 is a front view of the device as applied in inoperative condition;

Figure 2 is a front view of the device as applied in operative condition;

Figure 3 is a side view of the device in operative condition the door being shown as partly opened Figure 4 is a section taken substantially on line 4-4 of Fig. 1;

Figure 5 is a section taken substantially on line 5-5 of Fig. 1;

Figure 6 is a front view of the device with the top of the bell removed.

The device includes a base plate 1. adapted to be secured by means of screws 2, or in any other suitable or preferred manner, to a door A or other hinged structure. This plate supports a bell B of a known type which includes a cover 6 threaded upon a post 0 associated with suitable gearing and a spring motor mounted in a casing C, the spring motor being wound by turning top or cover Z). A striker D is operated by means of a pallet E associated with the gearing and is normally held against operation by a locking finger e which is normally pressed outwardly and engages stem (Z of the striker. A button F is slidable through casing C and when forced inwardly releases the striker D which latter is vibrated so as to strike the top or cover I) thus giving an alarm. This bell is of a known type and need not, there fore, be further described in detail.

A supporting plate 3 is secured upon plate 1 and is provided adjacent to its lower end with a transversely extending sleeve 4 through which is rockably and slida'bly mounted the longer arm 5 of a U-shaped control member 5 which'is formed by a suit ably bent piece of wire, or in any other suitable or preferred manner. At its outer end arm 5 is bent Substantially at right :11 gles to provide an arm 6 having at its outer end a plurality of coils forming a cylindrical element 6 The shorter arm 5 of the U-shaped control member 5 has its outer end turned to provide an angularly disposed element 5. A tension spring 7 is secured at one end to arm 5 and at its other end to an angularly disposed finger 8 formed at the upper end of plate 3. Sleeve 4 is cut away at its outer end to provide a slot 4 and an outwardly pro jecting stop element 4. This slot permits arm 5 to be slid into sleeve 4 to such an extent as to cause arm 6 to contact with element .4, this element positively limiting rearward movementof the arm and serving to hold the bight portion 5 of the U-shaped control member 5 out of contact with button F. When arm 5 is projected from sleeve 4 arm 6 is moved out of contact with arm 4 thus permitting the U-shaped member 5 to be rocked downwardly and rearwardly in sleeve 4 bringing element 5 into contact with button F thus forcing the button inwardly of easing C so as to release the striker operating mechanism and give an alarm (Figs. 2 and 6).

In practice the device is secured to door A adjacent to the free edge of the door so that, when arm 5 is projected member 6 is positioned to strike against the adjacent door jamb or frame A. When it is desired to set the device, arm 5- is slid outwardly in sleeve 4 and arm 6 is held against downward and rearward movement as the door is closed. When the door is closed member 6' presses against door jamb A and serves to hold bight element 5 of the control member out of contact with. button F (Fig. 2). Upon the door being opened the control member is rocked rearwardly and downwardly by spring 7 thus forcing button F inwardly of easing C and giving the alarm in the event of an unauthorized person not aware of or familiar with the alarm device attempting to enter through the doorway (Fig. 3). This provides very simple and eflicient means whereby the device may be rendered operative or inoperative as desired and, when applied, the device presents a neat and attractive appearance as well as being highly efiicient and of simple construction and operation.

I It may be found desirable in practice to resort to changes in details of construction and arrangement of parts of the invention, and I intend to include all such variations, as fall within the scope of the appended claims, in this application in which a preterred form only of my invention is disclosed.

What I claim is:

1. In a device of the character described, a supporting plate, a motor operated bell mounted on the plate and including a normally projected releasing button, a sleeve on the plate, a control member rockably and slidablymounted in the sleeve and provided with an element disposed to contact with the button, means for rocking said member toward the button, and an angularly disposed element extending from the outer end of said control member and at an inclination thereto, said sleeve being cut away at its outer end to provide a slot'for receptionv 1 ,435,esa

mally projected releasing button, a sleeve on the plate, a substantially U-shaped control member having one arm loosely mounted through the sleeve and its bight portion disposed for contact with said button, and means connecting the other arm of the control member to the plate and acting to rock said control member toward the button, that arm of the U-member which is mounted in the sleeve being provided at its outer end With an angularly disposed element arranged at an inclination thereto, the sleeve being provided with a slot at its outer end :for reception of said angularly disposed element, one wall of the slot coacting with said element to prevent movement of the bight portion of the control member into contact with the button when said control member is slid into the sleeve.

3. In a device of the character described, a supporting plate, a motor operated bell mounted on the plate and including a normally projected releasing button, a control member rockably and slidably mounted on said plate and provided with an element positioned to contact with said button, means for rocking said member toward the button, and means forlimiting rocking movement of the control member so as to.

hold said element out of contact with the button when said control member is in re- 

